Traverse motion mechanism of drum winders



Feb. 11, 1941. K; SAKAMOTO TRAVERSE MOTION MECHANISM OF DRUM WINDERS Fiiedflct. 24, 1938 Patented Feb. 11, 1941 UNITED, STATES PATENT OFFICE ERS Kyugoro Sakamoto, Hamamatsu, Japan Application October 24, 1938, Serial Noc2 36fl3'i In Japan June 18, 1938 2Claims. (or. 242 43) This invention relates to improvements in a traverse motion'mechanism of drum winders for winding a strand on a bobbin.

In a known drum winder wherein a drum with a a continuous helical groove of opposite directions a rocking guide bar in front of the druin so that the entering direction of a strand automatically v15 changes to and fro so as to conform to the direction of the helical groove on the drum by which the strand is guided.

In the drawing, Figure l is a side elevation of a drum winder provided with a traverse motion Q mechanism according to this invention.

Figure? is a front elevationof Figure 1. Figure 3 is a part sectional plan view of the 'same. In an ordinary drum winder of this kind, a strand is sent to the drum through a fixed guide point which is situated at a distance in front of the drum, and is directly received by a continu .ous spiral groove. For this reason, the entering direction of the strand relative to the axial line of the drum is reversed on each side of a line corresponding to the line 0-0 of Fig. 3 of the drawing connecting the fixed guide point and the longitudiiial center of the drum, so that it coincides with the direction of the spiral groove on one side of the-line, while it is in an opposite direction to that of the groove on the other side of the line. Therefore, when a strand is received I and guided by the groove on one side of the above line where the direction of the groove is opposite to the entering direction of the strand, and the strand is being received at a point where the grooveis intersecting, the strand is apt to get in the wrong groove the direction of which coincides 45 with the entering direction of the strand.

in order to avoid this drawback, the grooves of opposite directions havebeen prepared in different constructions and/or arrangements at in-- tersecting points so as to guide the strand in a 50 correct groove, but the manufacture of such grooves on the drum is very dimcult and expensive.

According to this invention, the entering direction of the strand always coincides with the digg rection of the groove so that a special construction or arrangement of the groove at intersecting points is not required. t

In the drawing, l is the frame of the drum winder on which are mounted shafts 2 and 3. A drum 6 and a pinion I are fixed on the shaft 2 6 while a circular cam it and a tooth wheel 8 are fixed on the shaft}, the pinion 1 and the wheel 8 being geared together.

A pair of levers 10 are pivoted on the frame at a spindle 5, and a spindle l I for a bobbin is freely 10 mounted on the. levers ID. A crank lever l2--l3-I4 is loosely mounted on the frame through a hollow bracket l5, and a spring It acts to have a roller ll provided at the extreme end of the upper arm l2 of the crank lever in contact with the circular cam 9. a

A lever is pivoted on a pin 2i fixed to the frameQand a metal bar 22 extending along the lever 20 is fixed to the lever at one end, the free end being bent in a right oracute angle so as to 20 prevent a running strand from getting ofi the metallic bar. The lever 20 is linked at an end with the free end of the lower arm it of thecrank lever, so that when the crank lever is rocked the lever 20 is also rocked.

The gear ratio of the toothed wheel 8 and the pinion 6 is determined by the number of pitches of the spiral groove, so that the circular cam 9 turns one revolution during the time that a strand returns to. the same point being guided along the continuous groove. If, for example, the groove has three pitches in each direction, the gear ratio should be six. 0

The profile of the cam surface is such the. about half a circumference is high and the other 55 half is low, the parts intermediate of these two surfaces being sloped. 'Each sloped part should be limited to such a circumferential length that the roller ll changes the position on the surfaces in a shorter time than that of the drum' 6. rotates "one revolution.

It is understood from the, above explanations that the lever 20 is rocked around the pin 2i,

taking alternately the position A-A and 3-13 on Figure 2, and each oblique position is kept u naltered during the time when the drum is rotating three turns in this example.

outermost intersecting point Gto the end of the groove H and-H to G, the-lever 20 changes its position from A-A to B- B,and within s.) that the strand is being guided from the other outermost intersecting pointE to theend F and 2 F to E, the lever changes its position from B- to A-A. In operation, a strand comes from -a source, not shown. through a fixed guide 23 to the groove on the drum, and is wound on the spindle ii. This spindle is rotated by friction caused at the contacting surface with the drum as illustrated on the attached drawing or may be driven inde pendent of the drum. Before the strand is received by the groove, it passes under the metal bar 22, which, when the strand is received by the groove traveling from. the point H .to F. takes the oblique position A-A, and when the strand is received from the p int F to H in the return travel, the bar takes the position B-B, so that the travel oi the strand-receiving point on. the drum naturally causes the strand to travel along the bar in the direction as shown by arrows R.

,When the strand-receiving point on the drum moves over the points G or E towards the end of the groove, the lever changes its position from A-.-A to 3-3 or 3-3 to A-=-A as above mentioned, so that the strand quickly advances'along the metallic bar toward its end, and returns to the opposite direction while the strand-receiving point on the drum is transfered to the groove 01 the opposite direction.

On account 01' this action, the entering angle of the strand will always coniorm to the direction o! the groove. so that the strand does not enter into the groove of the opposite direction when it is passing an intersecting point.

. What I claim is:

1. A traverse motion mechanism Tor drum a,ss1,141-

winders for winding strand material, comprising a rotating drum with a continuous and crossed helical groove thereon forreceiving and guiding a strand, 1!. guide bar in front of said drum, said bar being adapted to assume two oblique posi- ,tions opposite to each other relative to the axis of the drum and being arranged to guide the strand which is received by the helical groove on the drum, and means to quickly rock the 7 ing a rotating drum with a continuous and cross I helical groove thereon for receiving and guiding a strand, i a guide bar in front of said drum, said bar being adapted to assume two oblique positions opposite to each other relative to the axis of the drum and being arranged to guide the I strand which is received by the helical groove on the drum, a circular cam being rotatable in a definite relation with the drum so that the 4 cam rotates one turn while the drum rotates a number .of turns being twice the number of pitches of the helical groove in each direction, and a link member pivoted on the frame which transmits rocking motion from the cam to the guide bar so as to have the bar once take the oblique positions alternately in one turn of the cam.

KYUGORO SAKAMO'I'O. 

